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InterPlanetary Network
The InterPlanetary Network (IPN) is a group of spacecraft equipped with gamma ray burst (GRB) detectors. By timing the arrival of a burst at several spacecraft, its precise location can be found. The precision for determining the direction of a GRB in the sky is improved by increasing the spacing of the detectors, and also by more accurate timing of the reception. Typical spacecraft baselines of about one AU (astronomical unit) and time resolutions of tens of milliseconds can determine a burst location within several arcminutes, allowing follow-up observations with other telescopes.
==Rationale==
Gamma rays are too energetic to be focused with mirrors. The rays penetrate mirror materials instead of reflecting. Because gamma rays cannot be focused into an image in the traditional sense, a unique location for a gamma ray source cannot be determined as it is done with less energetic light.
In addition, gamma ray bursts are brief flashes (often as little as 0.2 seconds) that occur randomly across the sky. Some forms of gamma ray telescope can generate an image, but they require longer integration times, and cover only a fraction of the sky.
Once three spacecraft detect a GRB, their timings are sent to the ground for correlation. A sky position is derived, and distributed to the astronomical community for follow-up observations with optical, radio, or spaceborne telescopes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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